dear i face issue in log to oracle 19c as you can see in this scipt:-
C:\Users\Administrator>sqlplus
SQL*Plus: Release 19.0.0.0.0 - Production on Wed Jan 1 02:15:52 2020
Version 19.3.0.0.0
Copyright (c) 1982, 2019, Oracle. All rights reserved.
Enter user-name: system/system
Last Successful login time: Wed Jan 01 2020 02:02:54 -08:00
Connected to:
Oracle Database 19c Enterprise Edition Release 19.0.0.0.0 - Production
Version 19.3.0.0.0
SQL> ALTER SESSION SET CONTAINER=pdb1;
Session altered.
SQL> alter user ADDR identified by ADDR;
User altered.
SQL> connect ADDR/ADDR;
ERROR:
ORA-01017: invalid username/password; logon denied
Warning: You are no longer connected to ORACLE.
SQL>